Multiple Instance Spanning-Tree Operation

802.1s Multiple Spanning Tree Protocol (MSTP)

Configuring MST Instance Parameters

Command

 

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spanning-tree instance < 1..16

> vlan < vid> [ vid..vid ]

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no spanning-tree instance < 1..16 >

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spanning-tree instance < 1..16

> priority < 0..15 >

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spanning-tree priority < 0..15 >

 

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Syntax: spanning-tree instance < 1..16 > vlan < vid [ vid..vid ] > no spanning-tree instance < 1..16 >

Configuring MSTP on the switch automatically configures the IST instance and places all statically configured VLANs on the switch into the IST instance. This command creates a new MST instance (MSTI) and moves the VLANs you specify from the IST to the MSTI. At least one VLAN must be mapped to a MSTI when you create it. (A VLAN cannot be mapped to more than one instance at a time.) You can create up to 16 MSTIs in a region. Use the no form of the command to remove a VLAN from an MSTI. (Removing a VLAN from an MSTI returns the VLAN to the IST instance, where it can either remain or be reassigned to another MSTI configured in the region.)

The no form of the command deletes the specified MSTI and returns all VLAN assignments to the region’s IST instance.

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